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60=30+2z
We move all terms to the left:
60-(30+2z)=0
We add all the numbers together, and all the variables
-(2z+30)+60=0
We get rid of parentheses
-2z-30+60=0
We add all the numbers together, and all the variables
-2z+30=0
We move all terms containing z to the left, all other terms to the right
-2z=-30
z=-30/-2
z=+15
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